[blehn]

how about two flexible strips of LEDs? one wraps around the seatpost, the other around the stem. same overhead as front and rear lights, but you can easily see them from the sides.

[DasIch]

Imagine both solutions at night in 50m distance. In which case can you identify that the light source comes from a bicycle?

The nori lights while novel make it immediately obvious that you are looking at a bicycle and that allows others to take appropriate action.